Method for treating SO2 in coal firing smoke by red mud

Abstract

The present invention relates to waste utilization and coal burning fume purification, and is especially process of eliminating SO2 from coal burning fume with red mud as waste from alumina production. The present invention features red mud is used as absorbent for eliminating SO2 and other harmful gas from coal burning fume. The process includes mixing red mud and water to form dilute red mud slurry of liquid / solid ratio 10-15 to 1, counter flow contacting the dilute red mud slurry with coal burning fume for adsorbing and absorbing SO2 and other harmful gas, exhausting circularly absorbed red mud slurry becoming neutral, and depositing separation to obtain red mud further used as building material. The present invention realizes clean production.

Description

technical field

[0001] A method of using red mud to treat SO in coal-fired flue gas 2 The method relates to a method for the utilization of smelting process waste and the purification of coal-fired flue gas, especially the removal of SO in coal-fired flue gas by using red mud, which is a waste of alumina production. 2 Methods. Background technique

[0002] Red mud is a waste product produced by the alumina industry. The chemical composition is extremely complex and the alkalinity is very high. The pH value of the attached liquid is greater than 12.5. The comprehensive discharge of sewage is classified as waste water that exceeds the standard. The discharge of red mud is very large, and about one ton of red mud is discharged for every ton of alumina produced. In 2000, the domestic alumina output was 7 million tons, and about 7 million tons of red mud were discharged; in 2005, the domestic alumina output was 8.5 million tons, and about 8.5 million tons of red mud were discha...

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